Of the Coulter. 24 piough, as uſually made; and the ad- vantage which mußt attend the cover- ing the hollow between the head, ſheath, aud ftilt, with boards, to reduce it to a flat ſurface.

In the next place, this flat ſurface, which forms the land ſide of the plough, muſt be in the dire&ion of the plough's motion; that is to fay, a ſtraight line, drawn from the heel of the plough to the point to which the cattle are yoked, muſt touch the land ſide of the plough. If the ſurface of the land ſide of the plough, and the edge of the coulter, points to the right hand of the fore end of the beam, the plough will be thrown continually from the land; by the reſi tance which it meets with on that ſide, the contrary efe will be produced if

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